'Cans Festival' marks London

Graffiti impresario Banksy and airbrush-wielding guerrilla artists blanketed the walls of an abandoned London tunnel with offbeat murals Friday as part of a three-day stencil-art street party.

Banksy marshaled more than three dozen international artists for what he's calling the "Cans Festival" -- and is encouraging visitors to contribute their own graffiti starting today.

"I'm hoping we can transform a dark forgotten filth pit into an oasis of beautiful art -- in a dark forgotten filth pit," Banksy was quoted as saying in the Times of London, which carried a preview of the exhibition Friday.

Unlike many of Banksy's previous stunts, the exhibition was approved by Eurostar, which manages the site under its old train platform at Waterloo Station.